Here is my current list of must have jQuery plugins as of July 2008. I don’t start a project without the latest version of these plugins in my javascript directory.

• Impromptu
  BlockUI from Mike Alsup is awesome, this is just a little lighter and less code for relatively simple dialogs.
• Cycle
  Mike Alsup has another winner here. Great for animated image slideshows.
• Cookies
  A super easy way to manage cookies the jQuery way.
• Lava Lamp Menu
  This menu showcases a very unique lava lamp effect on hover.
• Table Sorter
  This plugin has it all: Multi-column sorting, paging, and striping.
• Autocomplete
  This stalwart of jQuery plugin has been recently updated and is as useful as ever.

More information

Don’t forget to check out my list from May 2008 and my list of jQuery Twitter’ers.